Tokyo Virus

 Virus Name:  Tokyo 
 V Status:    Rare 
 Discovery:   August, 1991 
 Symptoms:    .EXE file growth; system hangs; programs may not function 
 Origin:      Japan 
 Eff Length:  1,258 - 1,273 Bytes 
 Type Code:   PNE - Parasitic Resident .EXE Infector 
 Detection Method:  ViruScan, Sweep, IBMAV, NAV, NAVDX, VAlert, 
                    PCScan, F-Prot, AVTK 7.68+, 
                    NShld, Sweep/N, IBMAV/N, NAV/N, LProt, AVTK/N 7.68+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Tokyo virus was discovered in Japan in August, 1991.  Tokyo is 
       a non-resident direct action infector of .EXE programs. 
       When a program infected with Tokyo is executed, the virus may infect 
       one .EXE file in the current directory.  Infected .EXE programs will 
       increase in size by 1,258 to 1,273 bytes, with the virus being 
       located at the end of the infected file. 
       Systems infected with Tokyo may experience frequent system hangs 
       when attempts are made to execute infected programs.  When the 
       system hang does not occur, often the infected program will not 
       behave as the user is expecting, with pauses occurring in output 
       operations, such as to the system display. 
       It is unknown if Tokyo does anything besides replicate. 

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